Servicemen of “Kiev 12” military defence battalion react as they take part in a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. Servicemen of the battalion returned to Kiev after taking part in fighting in eastern Ukraine. (Photo by Gleb Garanich/Reuters)

A serviceman of “Kiev 12” military defence battalion runs with his mother before a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion pose for pictures before a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A woman embraces her boyfriend from “Kiev 12” military defence battalion before a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion react as they take part in a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A serviceman of “Kiev 12” military defence battalion kisses an icon as he prepares takes part in a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A serviceman of “Kiev 12” military defence battalion holds his daughter as he march on Khreshchatyk street during a welcoming ceremony in Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A woman kisses her boyfriend from “Kiev 12” military defence battalion before a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A serviceman of “Kiev 12” military defence battalion holds his daughter as he march on Khreshchatyk street during a welcoming ceremony in Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion sing a national anthem as they take part in a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion take part in a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A serviceman of "Kiev 12" military defence battalion embraces his daughter as he attends a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A serviceman of “Kiev 12” military defence battalion embraces his daughter as he attends a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

A serviceman of “Kiev 12” military defence battalion holds a hand of his son as he attends a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion react as they take part in a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion light candles to honour the memory of their dead comrades after a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)

Servicemen of “Kiev 12” military defence battalion light candles to honour the memory of their dead comrades after a welcoming ceremony in central Ukrainian capital Kiev December 6, 2014. (Photo by Gleb Garanich/Reuters)